Power supply circuit of moving object

Abstract

A power supply circuit of an aircraft includes: a first power transmission path for transmitting electric power from each of a first main power source device and a second main power source device to a first load device and a second load device; a first current sensor; a second current sensor; a third current sensor; and a fourth current sensor, and determines whether an abnormality has occurred based on currents detected by the first current sensor, the second current sensor, the third current sensor and the fourth current sensor.

The invention claimed is: 
     
       1. A power supply circuit of a moving object, the power supply circuit comprising:
 a first power transmission path configured to transmit electric power from one first power source and at least one second power source to one first load and at least one second load; 
 a first contactor unit configured to switch between a conduction state in which electricity flows and an interruption state in which flow of electricity is interrupted, between the first power source and the first power transmission path; 
 at least one second contactor unit configured to switch between the conduction state and the interruption state, between the at least one second power source and the first power transmission path; 
 a third contactor unit configured to switch between the conduction state and the interruption state, between the first load and the first power transmission path; 
 at least one fourth contactor unit configured to switch between the conduction state and the interruption state, between the at least one second load and the first power transmission path; 
 a first current sensor configured to detect a current between the first contactor unit and the first power transmission path; 
 at least one second current sensor configured to detect a current between the at least one second contactor unit and the first power transmission path; 
 a third current sensor configured to detect a current between the third contactor unit and the first power transmission path; 
 at least one fourth current sensor configured to detect a current between the at least one fourth contactor unit and the first power transmission path; 
 a second power transmission path provided in parallel with the first power transmission path and configured to transmit electric power from the one first power source and the at least one second power source to the one first load and the at least one second load; 
 a fifth contactor unit configured to switch between the conduction state and the interruption state, between the first power source and the second power transmission path; 
 at least one sixth contactor unit configured to switch between the conduction state and the interruption state, between the at least one second power source and the second power transmission path; 
 a seventh contactor unit configured to switch between the conduction state and the interruption state, between the first load and the second power transmission path; and 
 at least one eighth contactor unit configured to switch between the conduction state and the interruption state, between the at least one second load and the second power transmission path, 
 wherein when the first contactor unit, the at least one second contactor unit, the third contactor unit, and the at least one fourth contactor unit are in the conduction state, determination is made as to whether or not an abnormality has occurred in the first power transmission path, whether or not an abnormality has occurred between the first power source and the first contactor unit, and whether or not an abnormality has occurred between the first load and the third contactor unit, based on the current detected by each of the first current sensor, the at least one second current sensor, the third current sensor, and the at least one fourth current sensor, and 
 wherein each of the fifth contactor unit, the at least one sixth contactor unit, the seventh contactor unit, and the at least one eighth contactor unit is brought into the conduction state or the interruption state based on a result of the determination as to whether or not the abnormality has occurred in the first power transmission path, whether or not the abnormality has occurred between the first power source and the first contactor unit, and whether or not the abnormality has occurred between the first load and the third contactor unit. 
 
     
     
       2. The power supply circuit of the moving object according to  claim 1 , wherein
 in a case where: a magnitude of the current detected by the first current sensor is equal to or greater than a predetermined value and a direction of the current detected by the first current sensor is not a predetermined direction; a magnitude of the current detected by the at least one second current sensor is equal to or greater than the predetermined value and a direction of the current detected by the at least one second current sensor is the predetermined direction; a magnitude of the current detected by the third current sensor is less than the predetermined value; and a magnitude of the current detected by the at least one fourth current sensor is less than the predetermined value, it is determined that the abnormality has occurred between the first power source and the first contactor unit. 
 
     
     
       3. The power supply circuit of the moving object according to  claim 1 , wherein
 in a case where: a magnitude of the current detected by the first current sensor is equal to or greater than a predetermined value and a direction of the current detected by the first current sensor is a predetermined direction; a magnitude of the current detected by the at least one second current sensor is equal to or greater than the predetermined value and a direction of the current detected by the at least one second current sensor is the predetermined direction; a magnitude of the current detected by the third current sensor is less than the predetermined value; and a magnitude of the current detected by the at least one fourth current sensor is less than the predetermined value, it is determined that the abnormality has occurred in the first power transmission path. 
 
     
     
       4. The power supply circuit of the moving object according to  claim 1 , wherein
 in a case where: a magnitude of the current detected by the first current sensor is equal to or greater than a predetermined value and a direction of the current detected by the first current sensor is a predetermined direction; a magnitude of the current detected by the at least one second current sensor is equal to or greater than the predetermined value and a direction of the current detected by the at least one second current sensor is the predetermined direction; a magnitude of the current detected by the third current sensor is equal to or greater than the predetermined value and a direction of the current detected by the third current sensor is the predetermined direction; and a magnitude of the current detected by the at least one fourth current sensor is less than the predetermined value, it is determined that the abnormality has occurred between the first load and the third contactor unit. 
 
     
     
       5. The power supply circuit of the moving object according to  claim 1 , wherein
 the first contactor unit, the at least one second contactor unit, the third contactor unit, the at least one fourth contactor unit, and the fifth contactor unit are brought into the interruption state, and the at least one sixth contactor unit, the seventh contactor unit, and the at least one eighth contactor unit are brought into the conduction state, in a case where it is determined that the abnormality has occurred between the first power source and the first contactor unit. 
 
     
     
       6. The power supply circuit of the moving object according to  claim 1 , wherein
 the first contactor unit, the at least one second contactor unit, the third contactor unit, and the at least one fourth contactor unit are brought into the interruption state, and the fifth contactor unit, the at least one sixth contactor unit, the seventh contactor unit, and the at least one eighth contactor unit are brought into the conduction state, in a case where it is determined that the abnormality has occurred in the first power transmission path. 
 
     
     
       7. The power supply circuit of the moving object according to  claim 1 , wherein
 the first contactor unit, the at least one second contactor unit, the third contactor unit, the at least one fourth contactor unit, and the seventh contactor unit are brought into the interruption state, and the fifth contactor unit, the at least one sixth contactor unit, and the at least one eighth contactor unit are brought into the conduction state, in a case where it is determined that the abnormality has occurred between the first load and the third contactor unit.